I was at a jazz jam yesterday night (Copenhagen Jazz Festival) and there were a lot of different (really skilled) musicians playing, but no women! And when I get to think of it, I have been to quite a few jazz event and don't remember seeing any female musicians, only singers! But jazz has a huge nerd factor as well! A lot women in the audience though. I really think the nerd factor plays a large role in general when it relates to relative low number of women musicians (minus singers) in many music genres.